display-s6e63m0: revert "remove DDR_50_OPP requirements for screen on"

6ce09c8b604e6d68415e9451456087a2d5ced3bb
It caused screen tearing and flickering
RCU: Joe's RCU

Forward port jRCU to linux-3.0.

Thanks goes to Francisco Franco for his help
in testing out this version on the Android
Galaxy Nexus phone.

Signed-off-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Ezekeel <notezekeel@googlemail.com>
mali: fix error in boost logic

it sometimes caused mali boost to lock up at high freq regardless of
the load
mali: add mutex locking to boost logic